Concept:Grafting is a vegetative propagation method where parts of two related plants are joined to grow as one.Explanation:In grafting, a shoot or scion from one plant is joined to a rooted stock of another related plant.The two parts must be closely related for successful union and growth.This is different from sexual fusion of gametes, rooting of stems, or simply transferring a bud.Answer:D. The joining of two parts from related crops.